Freelancer profile translated to English.
Back to original languageAbout Rubén
I build digital products that generate results: SaaS with payments and subscriptions, cross-platform mobile apps, high-converting landing pages, and AI-powered automations.
I work with Next.js, Flutter, and Firebase/Supabase, and integrate LLM models (GPT-4, Claude, Gemini) to create intelligent experiences: chatbots, autonomous agents, content generation, and AI pipelines.
I don't just deliver code: I get involved in the business, focus on user experience, and ensure the product reaches its first customers. I've founded and launched my own SaaS products, so I understand the journey from zero to production.
I can help you with:
- Rapid SaaS or mobile app MVPs
- Integrating LLMs and AI agents into your product
- Automations that save time and money
- SEO-optimized websites and landing pages with Next.js
If you have an idea and want to move it fast, let's talk.
Spanish
Native or bilingual
English
Fluent
Remote only
Primarily works remotely
Experience
- Momentum CoachFounderSOFTWARE PUBLISHINGSeptember 2025 - Today (9 months)Madrid, SpainPowerlifting application with artificial intelligence developed in Flutter and Firebase. Full-stack architecture design, LLM model integration for personalized coaching, training plan management, and monetization with subscriptions.
- SF StudioCo-FounderSOFTWARE PUBLISHINGFebruary 2025 - Today (1 year and 4 months)Madrid, SpainWeb and custom App development studio. Development of mobile applications with Flutter, websites with Next.js, and custom digital solutions for clients. Specialization in cloud architecture, API integrations, and production deployment.
- Holaluz.comTeam Lead & Senior Software EngineerApril 2023 - January 2025 (1 year and 9 months)As a Senior Engineer, I was maintaining, evolving, and creating some of the company's core applications and services. From high-concurrency Rest/Microservices and asynchronous messaging with Kotlin/PHP + SNS/SQS/Kafka in a DDD architecture, to very Legacy Java 1.8 code and batch processes in a, let's say, not-so-friendly ERP.
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Education
- Introduction to Objective C & iOS Eclipse IDE for Beginners: Increase Your Java Productivity Project Management with Agile Methodologies and Lean Approaches. JUnit Tutorial for BeginnersIntroducción a Objective C & iOS Eclipse IDE for Beginners: Increase Your Java Productivity Gestión de proyectos con metodologías Ágiles y enfoques Lean. JUnit Tutorial for Beginners
- University Expert in DevOps & Cloud, Computer Science/Computer Systems TechnologyUNIR - The Online University2022Experto Universitario en DevOps & Cloud, Tecnología informática/Tecnología de sistemas informáticos